Desensitization of pressed RDX/paraffin and HMX/paraffin compounds by multiple shock waves

1995 ◽  
Vol 31 (2) ◽  
pp. 227-235 ◽  
Author(s):  
S. A. Bordzilovskii ◽  
S. M. Karakhanov
Keyword(s):  
Shock Waves ◽  
Multiple Shock

Multiple shock compression using a piston of finite weight

1960 ◽  
Vol 8 (2) ◽  
pp. 264-272 ◽  
Author(s):  
D. F. T. Winter
Keyword(s):  
Wind Tunnel ◽  
Shock Waves ◽  
Shock Compression ◽  
Compression Process ◽  
Real Gas ◽  
Hypersonic Wind Tunnel ◽  
Multiple Shock ◽  
Gas Properties

This paper describes a theory for a piston-operated compressor in which shock waves are used to heat the gas being compressed. Detailed calculations are given showing the use of such a compressor to heat air for use in a hypersonic wind tunnel. The effect of real gas properties on the compression process is included in this discussion.

Ice breaking by a collapsing bubble

2018 ◽  
Vol 841 ◽  
pp. 287-309 ◽  
Author(s):  
Pu Cui ◽  
A-Man Zhang ◽  
Shiping Wang ◽  
Boo Cheong Khoo
Keyword(s):  
Shock Waves ◽  
Vertical Direction ◽  
Plate Motion ◽  
Ice Thickness ◽  
And Shock Waves ◽  
Air Interface ◽  
Ice Fracturing ◽  
Wave Incidence ◽  
Multiple Shock ◽  
Bubble Behaviour

This work focuses on using the power of a collapsing bubble in ice breaking. We experimentally validated the possibility and investigated the mechanism of ice breaking with a single collapsing bubble, where the bubble was generated by underwater electric discharge and collapsed at various distances under ice plates with different thicknesses. Characteristics of the ice fracturing, bubble jets and shock waves emitted during the collapse of the bubble were captured. The pattern of the ice fracturing is related to the ice thickness and the bubble–ice distance. Fractures develop from the top of the ice plate, i.e. the ice–air interface, and this is attributed to the tension caused by the reflection of the shock waves at the interface. Such fracturing is lessened when the thickness of the ice plate or the bubble–ice distance increases. Fractures may also form from the bottom of the ice plate upon the shock wave incidence when the bubble–ice distance is sufficiently small. The ice plate motion and its effect on the bubble behaviour were analysed. The ice plate motion results in higher jet speed and greater elongation of the bubble shape along the vertical direction. It also causes the bubble initiated close to the ice plate to split and emit multiple shock waves at the end of the collapse. The findings suggest that collapsing bubbles can be used as a brand new way of ice breaking.

Interaction and Reflection of Shock Waves in Three-Dimensional Turbulent Flow

2006 ◽  
Author(s):  
Khaled Alhussan
Keyword(s):  
Shock Waves ◽  
High Speed ◽  
Three Dimensional ◽  
Oblique Shock ◽  
Expansion Waves ◽  
Reflected Shock ◽  
Slip Surfaces ◽  
Compression And Expansion ◽  
Complex Fluid ◽  
Multiple Shock

In this paper some characteristics of non-steady, compressible, flow are explored, including compression and expansion waves creation reflection and interaction shock waves. The work to be presented herein is a Computational Fluid Dynamics investigation of the complex fluid phenomena that occur inside 2-D and 3-D regions, specifically with regard to the structure of the oblique shock waves, the reflected shock waves and the interactions of the shock waves. The flow is so complex that there exist oblique shock waves, expansion fans, slip surfaces, and shock wave reflections and interactions. The flow is non-steady, viscous, compressible, and high-speed supersonic. This paper will show a relationship between the Mach numbers and the angles of the reflected shock waves, over a double step, opposed equal wedges, and opposed unequal wedges. The aim of this paper is to study the characteristics of the flow inside 2-D and 3-D regions where creation, reflection and interaction of multiple shock waves.

Growth induced by multiple shock waves normally incident on plane gaseous interfaces

1989 ◽  
Vol 37 (1-3) ◽  
pp. 248-263 ◽  
Author(s):  
Martin Brouillette ◽  
Bradford Sturtevant
Keyword(s):  
Shock Waves ◽  
Multiple Shock

Detonation Behaviors of Nitromethane with Various Initiating Shock Pressure

2007 ◽  
Vol 566 ◽  
pp. 41-46 ◽  
Author(s):  
Hideki Hamashima ◽  
Akinori Osada ◽  
Shigeru Itoh ◽  
Yukio Kato
Keyword(s):  
Shock Waves ◽  
High Speed ◽  
Shock Pressure ◽  
High Speed Photography ◽  
Detailed Structure ◽  
Complicated Structure ◽  
Low Velocity ◽  
Cavitation Field ◽  
Liquid Explosives ◽  
Multiple Shock

Some liquid explosives have two different detonation behaviors: high velocity detonation (HVD) or low velocity detonation (LVD). The detonation behavior depends on the level of the initiating shock pressure. The detailed structure of LVD in liquid explosives has not yet been clarified. A physical model was proposed that LVD is not a self-reactive detonation, but rather a supported-reactive detonation from the cavitation field generated by precursor shock waves. In this study, high-speed photography was used to investigate the detonation behavior of nitromethane (NM) with the various initiating shock pressures. Stable LVD was not observed, only transient LVD was observed. A very complicated structure of LVD was observed: the interaction of multiple precursor shock waves, multiple oblique shock waves, and a cavitation field. Multiple shock waves propagating in non-detonating NM were observed for shock pressures below the range required for LVD, while above the LVD range HVD was observed.

Multiple Shock Waves and its Unsteady Characteristics in Internal Flows

2019 ◽  
Author(s):  
Jintu K. James ◽  
Heuy Dong Kim
Keyword(s):  
Shock Wave ◽  
Shock Waves ◽  
Flow Field ◽  
High Speed ◽  
Flow Characteristics ◽  
Wave Pattern ◽  
Time Resolved ◽  
Constant Area ◽  
Boundary Layer Interaction ◽  
Multiple Shock

Abstract Shock wave turbulent boundary layer interaction is a fundamental phenomenon observed in most of the gas dynamics applications such as wind tunnels, supersonic air intakes, transonic airfoil, nozzle flows, etc. The flow field and shock wave pattern in a constant area duct are analyzed experimentally. The focus of the present study is to present the time-resolved flow characteristics of the multiple shock waves and its oscillations. High-speed Schlieren flow visualization is used to capture the transient shock structure in the wind tunnel constant area test section. A gradient-based image processing was incorporated to capture the shock excursion details. Results indicate that the shock pattern is unsymmetrical in the flow field. The foot of the lambda shock wave in the upper and lower exhibit a difference in axial location and there is a large difference in this value at the mean position when the shock moves in the upstream direction compared to the downstream movement.

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